5,582
edits
Changes
Jump to navigation
Jump to search
Ruminant Stomach - Anatomy & Physiology (view source)
Revision as of 14:17, 5 July 2010
, 14:17, 5 July 2010→Introduction
The ruminant stomach occupies most of the left hand side of the abdomen. It is a vast structure, holding up to 60 litres in an adult cow. The rumen holds 80%, reticulum 5%, omasum 8% and abomasum 7% in larger ruminants. In smaller ruminants the proportions are slightly different, with the rumen holding 75%, reticulum 8%, omasum 4% and abomasum 13%.
The ruminant stomach occupies most of the left hand side of the abdomen. It is a vast structure, holding up to 60 litres in an adult cow. The rumen holds 80%, reticulum 5%, omasum 8% and abomasum 7% in larger ruminants. In smaller ruminants the proportions are slightly different, with the rumen holding 75%, reticulum 8%, omasum 4% and abomasum 13%.
The different compartments of the ruminant stomach develop from the foregut spindle in foetal life. During embyogenesis and after birth the [[The Abomasum - Anatomy & Physiology|abomasum]] is the largest of the compartments (over half of the weight and capacity of the four stomachs) due to the [[oesophageal groove|oesophageal groove]] directing milk from the oesophagus to the [[The Rumen - Anatomy & Physiology|rumen]] into the [[The Abomasum - Anatomy & Physiology|abomasum]], bypassing the [[The Reticulum - Anatomy & Physiology|reticulum]].
The different compartments of the ruminant stomach develop from the foregut spindle in foetal life. During embyogenesis and after birth the [[The Abomasum - Anatomy & Physiology|abomasum]] is the largest of the compartments (over half of the weight and capacity of the four stomachs) due to the [[oesophageal groove|oesophageal groove]] directing milk from the oesophagus to the [[The Rumen - Anatomy & Physiology|rumen]] into the abomasum, bypassing the [[The Reticulum - Anatomy & Physiology|reticulum]].
* In most animals, after swallowing, food leaves the [[Oesophagus - Anatomy & Physiology|oesophagus]] and enters the [[Forestomach - Anatomy & Physiology|stomach]]. In ruminants, food enters the [[The Abomasum - Anatomy & Physiology|abomasum]] after fermentation in the forestomach.
* In most animals, after swallowing, food leaves the [[Oesophagus - Anatomy & Physiology|oesophagus]] and enters the [[Forestomach - Anatomy & Physiology|stomach]]. In ruminants, food enters the [[The Abomasum - Anatomy & Physiology|abomasum]] after fermentation in the forestomach.